The Waste-plus-waste Method for Recovering Metals from Electroplating Wastes.
George-LC; Cochran-AA; Waters-RF
AIME Env Quality Conf Washington D c Preprint Eqc 48 1971 Jun; :8 pages
Addition of various acid wastes to alkaline cyanide wastes was investigated as a means of disposing of both materials. At final solution ph values near 7, metals and cyanides in both wastes were precipitated almost completely. The filtrate from this step was relatively harmless; compared with the original wastes, and met potable water standards for free cyanide content. Small amounts of hydrogen cyanide (hcn) were produced by the reactions; the hcn was collected and neutralized. The metal cyanide precipitate contained significant amounts of silver, nickel, and copper, which were separated and recovered by additional processing. The waste-plus- waste method is economically attractive because of the low cost of mixing two wastes and the high value of the recovered metals.
AIME Env. Quality Conf., Washington, D.c., Preprint Eqc 48, June 7- 9, 1971